FAQ – Frequently asked questions

Electricity consumption/ Electricity bill

1. Can a fixed-term electricity contract be cheaper than stock exchange electricity?

When comparing temporary ones, you would need to know approximately your own annual consumption (kWh). The profitability of exchange electricity is affected by the possibility of using cheaper usage hours.

2. Can car batteries charge the house with electricity at night, is it profitable?

External batteries are expensive and have a small capacity. In addition, most electric cars do not yet have the possibility of two-way use.

3. 170m2 in a detached house, electric heating. Heating the hot water storage tank with night electricity, does the electricity contract matter?

Exchange electricity is recommended, if it is possible to use cheaper night electricity.

4. Where can I find hourly electricity consumption data?

Hourly electricity consumption data can be found at www.data.fingrid.fi/fi/dataset/electricity-consumption-in-finland

5. Can I benefit from night electricity in exchange electricity?

Yes, the cheapest hours of exchange electricity are usually between 00:00 and 05:00.

6. How can automation be utilized in the use of stock exchange electricity?

At the very least, the devices cut out the most expensive operating hours, more advanced ones can also have temperature monitoring. In this case, the activity is focused on cheaper classes, weather permitting.

7. Can fixed-term electricity contracts be profitable?

Currently, exchange-traded electricity can be the most profitable (Tampere 2022).

Heat output

1. Can the protective case of the air heat pump be harmful?

A sensible enclosure does more good than harm; the most important thing is protection and sufficient “clearance” outside the outdoor unit, so that the incoming and outgoing flows do not mix too much with each other.

2. Can the fireplace be heated even though there is an air source heat pump in the same room?

Usually, the device’s own thermostat shuts off the device when the room temperature exceeds the thermostat setting. A running ILP helps spread the heat of the hearth.

3. Why does the cooling function of the air heat pump take more energy than the drying function?

In the cooling function, the main thing is to lower the temperature, in drying, the internal temperature cools down a little when the moisture is removed.

4. Is it reasonable to schedule the operation of the air heat pump?

In severe frosts, newer devices can turn themselves off, and some models have an internal timer that you can take advantage of. Timing through the socket is not recommended.

5. In an economy with two ILPs, is it worth keeping both pumps at the same setpoints or is one more dominant?

Basically, you should prefer a newer and more energy-efficient machine. Actual rotation between the machines is not recommended, the compressor speed is adjusted as needed, and the compressor also wears out from starting times.

6. Can the air source heat pump be turned off for the winter, and then heated only by the fireplace?

The use of ILP is recommended in mild weather, only fireplace heating in the cold season.

7. What kind of ILP adjustment makes sense during the cold season when heating the fireplace?

The device’s thermostat adjusts the operation according to the room temperature. During fireplace heating, the internal temperature of the ILP can be lowered by a couple of degrees, or not changed at all.

8. Do you dare to leave the air source heat pump on, e.g. during a week's absence?

The temperature can be lowered to 16 degrees during the absence, and an additional heater that ensures operation, e.g. an electric radiator, to 12 degrees. Check before departure that the indoor and outdoor units are ok and clean.

Heat distribution systems

1. In terms of energy consumption, is it more optimal to keep the floor heating at a constant temperature, or to use night electricity?

The reaction speed is affected by how deep the heating cable is (2cm/5cm). In terms of energy saving, optimizing heating is always profitable.

2. Can the underfloor heating be turned off completely in areas other than wet rooms?

Yes, if it is electric heating. In a water circulation system, it is advisable to always keep a small circulation on, so that the piping does not freeze.

3. How to balance the energy spikes of underfloor heating?

The cheapest hours of exchange electricity are usually 00–05, and the heating can be controlled for this time with clock switches, a smart thermostat or manual implementation.

4. Can the underfloor heating in the bathroom be closed and heat the space with a radiator?

Although the radiator produces air temperature with less energy, floor heating heats and thus dries the room more evenly. The use of night electricity is recommended.

5. What is the optimal floor heating level in wet rooms, considering drying after a shower?

Level and time are affected by structures, heating power, installation depth, electricity price.